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| Japanese Explosive Ordnance – Army Ammunition – Navy Ammunition |
| Chapter 4 – Section 1 |
| ARMY PROJECTILES |
| Type 97 and Type 98 - 20-mm Ammunition |
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There are four Army 20-mm guns using similar projectiles and three of these guns use the same cartridge case. The guns using the small size cartridge case are the type 97 anti-tank gun, the Ho 1 (flexible) and Ho 3 (fixed) aircraft guns. The type 98 antiaircraft/anti-tank gun uses the large size cartridge case. |
| Case: |
| Small | Large | ||
| Length: | 4.89 | 5.58 | |
| Diameter of base | 1.12 | 1.12 | |
| Weight (empty) (grams) | 129.9 | 208.3 |
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Both cases are made of drawn brass and are of the rimless type. The case is crimped to the projectile by three long crimps and sealed by a clear lacquer. |
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Propellant: The propellant is graphited smokeless powder made in single perforated cy-lindrical grains approximately 1 1/2 mm in diameter and 3 mm in length. The weight of the propellant in the small case is 35.8 grams and, in the large case, 58.9 grams. |
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Figure 208 – Type 97 and Type 98 20-mm Ammunition. |
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